1.2.4　执行start()的顺序不代表执行run()的顺序

注意，执行start()方法的顺序不代表线程启动的顺序，即不代表run()方法执行的顺序，执行run()方法的顺序是随机的。

创建测试用的项目名称为z，MyThread.java类代码如下：

package extthread;

public class MyThread extends Thread {

private int i;

public MyThread(int i) {
    super();
    this.i = i;
}
@Override
public void run() {
    System.out.println(i);
}

}

运行类Test.java代码如下：

package test;

import extthread.MyThread;

public class Test {

public static void main(String[] args) {
    MyThread t11 = new MyThread(1);
    MyThread t12 = new MyThread(2);
    MyThread t13 = new MyThread(3);
    MyThread t14 = new MyThread(4);
    MyThread t15 = new MyThread(5);
    MyThread t16 = new MyThread(6);
    MyThread t17 = new MyThread(7);
    MyThread t18 = new MyThread(8);
    MyThread t19 = new MyThread(9);
    MyThread t110 = new MyThread(10);
    MyThread t111 = new MyThread(11);
    MyThread t112 = new MyThread(12);
    MyThread t113 = new MyThread(13);

    t11.start();
    t12.start();
    t13.start();
    t14.start();
    t15.start();
    t16.start();
    t17.start();
    t18.start();
    t19.start();
    t110.start();
    t111.start();
    t112.start();
    t113.start();

}

}

图1-14　线程启动顺序与start()执行顺序无关

程序运行后的效果如图1-14所示，说明执行start()方法的顺序不代表执行run()方法的顺序，方法run()是被随机调用的，也从另外一个角度说明线程是随机执行的。